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Neurophotonics • Open Access

Prefrontal hemodynamic mapping by functional near-infrared spectroscopy in response to thermal stimulations over three body sites
Author(s): Amarnath Yennu; Fenghua Tian; Robert J. Gatchel; Hanli Liu

Paper Abstract

Functional near-infrared spectroscopy (fNIRS) was used to examine hemodynamic responses in the prefrontal cortex (PFC) during noxious thermal pain, induced by thermal stimulations over three different body sites over the right forearm, right temporomandibular joint, and left forearm. Functional NIRS measurements were obtained from three groups of healthy volunteers, one group for each body region. Each group was subjected to both low-pain stimulation (LPS) and high-pain stimulation (HPS) by a 16 × 16    mm 2 thermode of a temperature-controlled thermal stimulator over the respective three body sites. Our results showed that HPS given at three sites induced significant increases ( p < 0.05 ) in oxy-hemoglobin concentration ( Δ HbO ) in the PFC with similar temporal patterns in relatively spread PFC areas. In contrast, LPS did not cause any significant Δ HbO in the PFC of any subject group. Our observed PFC activations induced by acute HPS were generally consistent with previous reports by fMRI studies. The study also found a peculiar global trend of postpain deactivation in the PFC, which is attributed to global vasoconstriction due to acute nocuous pain. Overall, these results indicate that hemodynamic activities in PFC exhibit consistent temporal and spatial patterns in response to acute thermal stimulation given across all three body sites.

Paper Details

Date Published: 19 December 2016
PDF: 14 pages
Neurophoton. 3(4) 045008 doi: 10.1117/1.NPh.3.4.045008
Published in: Neurophotonics Volume 3, Issue 4
Show Author Affiliations
Amarnath Yennu, The Univ. of Texas at Arlington (United States)
Fenghua Tian, The Univ. of Texas at Arlington (United States)
Robert J. Gatchel, The Univ. of Texas at Arlington (United States)
Hanli Liu, The Univ. of Texas at Arlington (United States)

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